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Note 3 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Revenue from Related Parties |  | $ 408,000 | $ 388,000 |
Federal Income Tax Payments to Parent |  | $ 7,154,000 | 3,325,000 | $ 2,700,000
Ownership Percentage By Parent |  | 90.28% |  |
Value Line Inc [Member] |  |  |  |
Accounts Receivable, Related Parties |  | $ 0 | 0 |
EAM Trust [Member] |  |  |  |
Assets under Management, Carrying Amount |  | 4,960,000,000 | 3,580,000,000 |
Increase (Decrease) in Assets under Management |  | $ 1,400,000,000 |  |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities |  | 38.80% |  |
Non Voting Profits Interest Percent | 50.00% | 50.00% |  |
Percentage of Non Voting Revenues Interest in Unconsolidated Entity |  | 52.95% |  |
Non Voting Profits Interest in Variable Entity Not yet Paid |  | $ 4,664,000 | $ 2,949,000 |
EAM Trust [Member] | Minimum [Member] |  |  |  |
Non Voting Revenues Interest Percent |  | 41.00% |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
EAM Trust [Member] | Maximum [Member] |  |  |  |
Non Voting Revenues Interest Percent |  | 55.00% |  |

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